I am using bitcoins not just to buy things from because if i am going to buy something i will do it with cash you know i dont use bitcoins for that will such be a shame. Bitcoins are here in this world just for investments so invest with bitcoins buy things with cash.
There is no shame in converting bitcoin to cash, as bitcoin is also an form of money and if you are into any emergency then its always good to sell your coins to cash, and I think that is the reason we are earning it.